WO2018179543A1

WO2018179543A1 - Light-emitting device

Info

Publication number: WO2018179543A1
Application number: PCT/JP2017/038300
Authority: WO
Inventors: 金内　一浩; 恵介森谷; 忍安達
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2017-03-29
Filing date: 2017-10-24
Publication date: 2018-10-04

Abstract

A light-emitting device (10) is provided with: a substrate (100); a plurality of light-emitting parts (110) (a first light-emitting part (110a) and a second light-emitting part (110b)); a plurality of wires (120) (a first wire (120a) and a second wire (120b)); and a terminal part. The first wire (120a) connects the first light-emitting part (110a) and the terminal part (180). The second wire (120b) couples the second light-emitting part (110b) and the terminal part (180). The first wire (120a) and the second wire (120b) respectively include a first region (170a) and a first region (170b) which each overlap with a second electrode (160). The first wire (120a) intersects an edge (190a) of the second electrode (160) facing the terminal part (180). The second wire (120b) intersects an edge (190b) of the second electrode (160), the edge being different from the edge (190a) and facing the terminal part (180), and extends along the outer periphery of the second electrode (160).

Description

Light emitting device

The present invention relates to a light emitting device.

Recently, organic light emitting diodes (OLEDs) have been developed as light emitting devices. The OLED has a first electrode, an organic layer, and a second electrode. The organic layer includes a light emitting layer that emits light by organic electroluminescence. The light emitting layer emits light by a voltage between the first electrode and the second electrode.

OLED may be used for a light emitting device having a plurality of light emitting units such as a segment type display device. In this light emitting device, it may be desired to align the luminance of the plurality of light emitting units. For example, in Patent Document 1, in a segment type display device, the peak value of the current supplied to each segment is set to a value corresponding to the light emission area of each segment, and the difference in light emission luminance between the segments is suppressed. It is described that the luminance of a plurality of segments is controlled to be the same regardless of the light emitting area of each segment by changing the duty ratio for supplying current.

JP 2001-282160 A

The light emitting device as described in Patent Document 1 has a plurality of light emitting portions, and the range of brightness required for the light emitting device is wide (for example, from 1 cd / m ² approximately to 200 cd / m ² or more) In this case, it may be difficult to align the luminance of each light emitting unit to a desired value in all required luminance ranges. For example, when the brightness of the entire light emitting device is lowered, the difference in light emission brightness between segments may become significant.

An example of a problem to be solved by the present invention is to improve a difference in luminance of each light emitting unit in all luminances when the luminance range required for the light emitting device is wide.

The invention according to claim 1 is a first light emitting unit and a second light emitting unit having a laminated structure including a first electrode, an organic layer including a light emitting layer, and a second electrode,
A first wiring connecting the first electrode of the first light emitting unit and the terminal unit;
A second wiring connecting the first electrode of the second light emitting unit and the terminal unit;
With
The second electrode is located across the first light emitting part and the second light emitting part,
The first wiring intersects a side of the second electrode facing the terminal portion;
The second wiring is a light emitting device that intersects a side of the second electrode that does not face the terminal portion and extends along an outer periphery of the second electrode.

The invention described in claim 7
A first light emitting unit and a second light emitting unit having a laminated structure including a first electrode, an organic layer including a light emitting layer, and a second electrode;
A first wiring connecting the first electrode of the first light emitting unit and the terminal unit;
A second wiring connecting the first electrode of the second light emitting unit and the terminal unit;
With
The second electrode is located across the first light emitting part and the second light emitting part,
The first wiring intersects with the first portion of the outer periphery of the second electrode,
The second wiring is a light emitting device in which the second portion intersects at a second portion on the outer periphery of the second electrode, and the second portion is located farther from the terminal portion than the first portion.

The invention according to claim 10 is:
A first light emitting unit and a second light emitting unit having a laminated structure including a first electrode, an organic layer including a light emitting layer, and a second electrode;
A first wiring connecting the first electrode of the first light emitting unit and the terminal unit;
A second wiring connecting the first electrode of the second light emitting unit and the terminal unit;
With
The second electrode is located across the first light emitting part and the second light emitting part,
The first wiring intersects with the first portion of the outer periphery of the second electrode,
The second wiring intersects with a second part of the outer periphery of the second electrode, and the second part is located on the opposite side of the first part across the first light emitting part and the second light emitting part. It is a light emitting device.

The above-described object and other objects, features, and advantages will be further clarified by a preferred embodiment described below and the following drawings attached thereto.

It is a top view which shows the light-emitting device which concerns on a reference example. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a cross-sectional view taken along the line BB in FIG. It is a circuit diagram explaining the equivalent circuit of the light-emitting device shown in FIG. It is a figure which shows an example of the current waveform which a control part outputs to a light emission part. It is a figure explaining the voltage and light emission luminance of the light emission part in the area | region enclosed by A of FIG. It is a figure explaining the rise of the voltage of a light emission part, and light emission luminance. It is a top view which shows the light-emitting device which concerns on embodiment. It is a figure which shows another example of the current waveform which a control part outputs to a light emission part. It is a figure explaining the voltage and light emission luminance of the light emission part in the area | region enclosed by B of FIG. It is a figure explaining the rise of the voltage of a light emission part, and light emission luminance. 1 is a plan view showing a light emitting device according to Example 1. FIG. 6 is a plan view showing a light emitting device according to Example 2. FIG. 6 is a plan view showing a light emitting device according to Example 3. FIG. 6 is a plan view showing a light emitting device according to Example 4. FIG. 6 is a plan view showing a light emitting device according to Example 5. FIG. 6 is a plan view showing a light emitting device according to Example 6. FIG. 12 is a plan view showing a light emitting device according to Example 7. FIG. 10 is a plan view showing a light emitting device according to Example 8. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

In the following description, the control unit 200 indicates a functional unit block, not a hardware unit configuration. Each component of the control unit 200 includes an arbitrary arithmetic device, a memory, a program loaded in the memory, a recording medium such as a hard disk for storing the program, and an arbitrary combination of hardware and software centering on a network connection interface. It is realized by. There are various modifications of the implementation method and apparatus.

FIG. 1 is a plan view showing a light emitting device according to a reference example. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 3 is a cross-sectional view taken along the line BB of FIG. For the sake of explanation, FIG. 1 does not show the first electrode 130, the insulating layer 140, and the organic layer 150.

As shown in FIG. 1, the light emitting device 10 includes a substrate 100, a plurality of light emitting units 110 (first light emitting unit 110a, second light emitting unit 110b), a plurality of wirings 120 (first wiring 120a, second wiring 120b), and A terminal portion 180 is provided. The first wiring 120 a connects the first light emitting unit 110 a and the terminal unit 180. The second wiring 120 b connects the second light emitting unit 110 b and the terminal unit 180. The first wiring 120a and the second wiring 120b have a first region 170a and a first region 170b that overlap with the second electrode 160, respectively. Both the first wiring 120 a and the second wiring 120 b intersect the side 190 a facing the terminal portion 180 of the second electrode 160. The terminal unit 180 is connected to the control unit 200 (not shown).

FIG. 2 shows a cross section of the light emitting unit 110. The light emitting unit 110 includes a stacked structure of the first electrode 130, the organic layer 150, and the second electrode 160. In the stacked structure, a region exposed from the insulating layer 140 functions as the light emitting unit 110. In other words, the insulating layer 140 defines the light emitting unit 110. The 2nd electrode 160 is formed over the some light emission part 110, as shown in FIG.

FIG. 3 shows a cross section of the first region 170 that overlaps the second electrode 160 in the wiring 120. In the first region 170 of the wiring 120, the insulating layer 140, the organic layer 150, and the second electrode 160 are stacked. The wiring 120 is electrically connected to the first electrode 130 of the light emitting unit 110. The second electrode 160 is electrically connected to the second electrode 160 of the light emitting unit 110.

The substrate 100 has translucency. The substrate 100 includes, for example, glass or resin. The substrate 100 has a first surface 102 and a second surface 104. The light emitting unit 110 is on the first surface 102. The second surface 104 is on the opposite side of the first surface 102. In the example shown in FIGS. 1 to 3, the light emitting device 10 is a bottom emission type. That is, light from the light emitting unit 110 is emitted from the second surface 104 of the substrate 100 to the outside of the light emitting device 10. The light emitting device 10 may be a top emission type or a double-sided light emission type.

The first electrode 130 has translucency and conductivity. Specifically, the first electrode 130 includes a material having translucency and conductivity, for example, a metal oxide, for example, ITO (Indium Tin Oxide) and IZO (Indium Zinc Oxide). Contains at least one. Accordingly, light from the organic layer 150 can pass through the first electrode 130. The first electrode 130 may be formed simultaneously with the wiring 120. That is, the first electrode 130 and the wiring 120 may include the same material. Note that when the light-emitting device 10 is a top emission type, the first electrode 130 may not have a light-transmitting property.

The insulating layer 140 includes, for example, an organic insulating layer, specifically, for example, polyimide. In another example, the insulating layer 140 includes an inorganic insulating layer, specifically, silicon oxide (SiO 2).

The organic layer 150 includes at least a light emitting layer (EML). The organic layer 150 may further include any or all of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL).

The second electrode 160 has a light shielding property, more specifically, a light reflecting property, and further has conductivity. Specifically, the second electrode 160 includes a material having light reflectivity and conductivity, and includes, for example, a metal, specifically, for example, at least one of Al, Ag, and MgAg. Thereby, the light from the organic layer 150 is reflected by the second electrode 160 with hardly passing through the second electrode 160. In addition, when the light-emitting device 10 is a top emission type or a double-sided light emission type, the 2nd electrode 160 has translucency. As an example, the second electrode 160 includes MgAg. The thickness of the second electrode 160 is, for example, 15 nm or less.

FIG. 4 is a circuit diagram illustrating an equivalent circuit of the light emitting device 10 illustrated in FIG. As shown in FIG. 4, the light emitting unit 110 can be represented by a parallel circuit of a diode D and a capacitor _CE . The wiring 120 has a capacitance component because the organic layer 150 and the insulating layer 140 sandwiched between the wiring 120 and the second electrode 160 function as a dielectric. That is, the first region 170 shown in FIG. 1 is functioning as a capacitor C _L. In this equivalent circuit, the capacitor C _L (capacitance component of the wiring 120) is connected in parallel with the light emitting unit 110.

FIG. 5 is a diagram illustrating an example of a current waveform output from the control unit 200 to the light emitting unit 110. The control unit 200 is connected to the terminal unit 180 and applies a pulse current to the light emitting unit 110 via the wiring 120. In each graph of Fig.5 (a) and FIG.5 (b), a horizontal axis represents time and the vertical axis | shaft represents the electric current value. FIG. 5A shows a current waveform when the luminance is relatively high, and FIG. 5B shows a current waveform when the luminance is relatively low. As shown in FIG. 5A, when the luminance is relatively high, the pulse width (that is, the application time) of the pulse current becomes long. As shown in FIG. 5B, when the luminance is relatively low, the pulse width of the pulse current is shortened.

FIG. 6 is a diagram for explaining the voltage and light emission luminance of the light emitting unit 110 in the region surrounded by A in FIG. In each graph of FIG. 6A and FIG. 6B, the horizontal axis represents time, and the vertical axis represents voltage. Moreover, in each graph of FIG.6 (c) and FIG.6 (d), a horizontal axis represents time and the vertical axis | shaft represents light emission luminance. FIGS. 6A and 6C show waveforms of voltage and light emission luminance when the luminance is relatively high, and FIGS. 6B and 6D are cases where the luminance is relatively low. The waveforms of the voltage and emission luminance are shown. As described above, the light emitting unit 110 can be represented by a parallel circuit of the diode D and the capacitor _CE . The light emitting unit 110 starts to emit light when the voltage reaches a certain value. The light emission luminance is proportional to the current flowing through the diode D. However, the current charged in the capacitor _CE shown in the equivalent circuit of FIG. 4 does not contribute to the light emission luminance. Therefore, the rising period of the voltage generated in response to the time required to charge the capacitor C _E (i.e., delay time until light emission start) T _R is generated. As shown in FIG. 6 (a) and FIG. 6 (c), the case relatively high brightness, the proportion occupied by the rising period T _R for the whole light emission period T _E is reduced. As shown in FIG. 6 (b) and FIG. 6 (d), the case relatively low luminance, the ratio occupied by the rising period T _R for the whole light emission period T _E increases.

As illustrated in FIG. 1, the light emitting device 10 according to the reference example reduces the resistance value of the wiring 120 or reduces the area of the non-light emitting portion (for example, the area of the wiring 120) in the light emitting device 10. Therefore, the light emitting unit 110 and the terminal unit 180 may be connected at a distance as short as possible. Therefore, both the first wiring 120 a and the second wiring 120 b intersect the side 190 a facing the terminal portion 180 of the second electrode 160. Thereby, the area of the first region 170b of the second wiring 120b is larger than the area of the first region 170a of the first wiring 120a.

Generally, the smaller the capacitor area, the smaller the capacitor capacity, and the larger the capacitor area, the larger the capacitor capacity. In the light emitting device 10, when the area of the light emitting unit 110 is small, the capacity of the capacitor _CE is small, and when the area of the light emitting unit 110 is large, the capacity of the capacitor _CE is large. Also, the capacity of the area is small capacitor _{C L} of the first area 170 of the wire 120 is reduced, and also increases the capacitance of the capacitor _{C L} area of the first region 170 of the wiring 120 is large. If the capacitance of the capacitor C _E and the capacitor C _L is small, because the time required for charging becomes shorter, rising period T _R of the voltage is shortened. Further, when the capacitance of the capacitor C _E and the capacitor C _L is large, the time required for charging becomes longer, rising period T _R of the voltage is increased.

Figure 7 is a diagram for explaining a rise of the voltage and emission luminance of the light emitting portion 110 of the case where the capacity of the capacitor C _E and the capacitor C _L between the plurality of light emitting portions 110 is different. As in FIG. 6, in each graph of FIG. 7A and FIG. 7B, the horizontal axis represents time, and the vertical axis represents voltage. Moreover, in each graph of FIG.7 (c) and FIG.7 (d), a horizontal axis represents time and the vertical axis | shaft represents the light emission luminance. 7 (a) and 7 (c) show waveforms of voltage and light emission luminance when the luminance is relatively high, and FIGS. 7 (b) and 7 (d) show cases where the luminance is relatively low. The waveforms of the voltage and emission luminance are shown. As shown in FIG. 1, the area of the first light emitting unit 110a and the area of the second light emitting unit 110b are substantially equal, and the area of the first region 170b of the second wiring 120b is larger than the area of the first region 170a of the first wiring 120a. Again large, rise time _{T R} of the first light emitting portion 110a is shorter than the rise time _{T R} of the second light-emitting portion 110b. As an example, the rise time _{T R} of the first light emitting portion 110a rise time _T R 1, the rise time _{T R} of the second light emitting portion 110b becomes rising period _{T R} 2.

The relationship between the capacitor charging time t and the capacitance C of the capacitor can be expressed as dt / dV = C / I from the capacitor current formula I = C × dV / dt. Further, the capacitance C of the capacitor is represented by C = ε ₀ × ε × S / d. Here, ε ₀ is the dielectric constant of vacuum, ε is the relative dielectric constant of the dielectric, S is the electrode area, and d is the distance between the electrodes. In general, since the values of ε ₀ , ε, and d are constant in one light emitting device, it can be expressed as C = a × S (where a is a constant). Here, regarding the first regions of the light emitting unit 110 and the wiring 120, the areas are S _E and S _L , respectively, and the constants are a _E and a _L , respectively. Also, I is proportional to the area of the light emitting unit 110, when I = b × _{S E} (although, b is a constant), the following equation (1) holds.

Accordingly, between the plurality of light emitting portions _110, S L / _{S E,} that is, when the ratio of the area of the first region 170 of the light emitting portion 110 and the wiring 120 are equal, the rise time _{T R} of the voltage will be equal.

As described above, when the light emission luminance of the light emitting unit 110 is high, the pulse width of the pulse current becomes long, and when the light emission luminance is low, the pulse width of the pulse current becomes short. If the emission luminance is high, that is, when the as is shown in FIGS. 7 (a) and FIG. 7 (c), the difference between the rising period T _{R 1} and rising period T _{R 2} is compared to the total emission period T _E relative Therefore, the influence on the light emission luminance is small. That is, the difference in luminance between the first light emitting unit 110a and the second light emitting unit 110b is relatively small with respect to the light emission luminance. Therefore, the difference in luminance between the first light emitting unit 110a and the second light emitting unit 110b is difficult to recognize. In contrast, when the emission luminance is low, that is, when the as is shown in FIG. 7 (b) and FIG. 7 (d), the difference between the rising period T _{R 1} and rising period T _{R 2} is the overall emission period T _E Since it is relatively large in comparison, the influence on the light emission luminance is large. That is, the difference in luminance between the first light emitting unit 110a and the second light emitting unit 110b is relatively large with respect to the light emission luminance. Accordingly, the difference in the light emission luminance between the first light emitting unit 110a and the second light emitting unit 110b is easily recognized.

FIG. 8 is a plan view showing the light emitting device 10 according to the embodiment. In the present embodiment, the light emitting device 10 includes a substrate 100, a plurality of light emitting units 110 (first light emitting unit 110a, second light emitting unit 110b), a plurality of wirings 120 (first wiring 120a, second wiring 120b), and a terminal unit. 180. The first wiring 120 a connects the first light emitting unit 110 a and the terminal unit 180. The second wiring 120 b connects the second light emitting unit 110 b and the terminal unit 180. The first wiring 120a and the second wiring 120b have a first region 170a and a first region 170b that overlap with the second electrode 160, respectively. The first wiring 120 a intersects the side 190 a facing the terminal portion 180 of the second electrode 160. The second wiring 120 b intersects with a side 190 b different from the side 190 a facing the terminal portion 180 of the second electrode 160 and extends along the outer periphery of the second electrode 160.

The light emitting unit 110 includes a stacked structure of the first electrode 130, the organic layer 150, and the second electrode 160. In the stacked structure, a region exposed from the insulating layer 140 functions as the light emitting unit 110. In other words, the insulating layer 140 defines the light emitting unit 110. As shown in FIG. 8, the second electrode 160 is formed across the first light emitting unit 110a and the second light emitting unit 110b.

The planar shape of the first light emitting unit 110a and the second light emitting unit 110b is, for example, a polygon such as a rectangle, a hexagon, and an octagon, but may be a circle or a letter. In the case of a polygon, the corners may be rounded. The planar shape of the second electrode 160 is, for example, a polygon such as a rectangle, a hexagon, or an octagon, but may be a circle.

In the first region 170 of the wiring 120, the insulating layer 140, the organic layer 150, and the second electrode 160 are stacked. The wiring 120 is electrically connected to the first electrode 130 of the light emitting unit 110. The second electrode 160 is electrically connected to the second electrode 160 of the light emitting unit 110.

The light-emitting device 10 according to the present embodiment has the same configuration as that of the light-emitting device 10 according to the reference example except for the shape (at least the direction in which the first region 170b of the second wiring 120b is drawn). The first light emitting unit 110a is provided closer to the terminal unit 180 than the second light emitting unit 110b. In other words, the distance from the end on the terminal part 180 side of the first light emitting unit 110a to the terminal part 180 is closer than the distance from the end on the terminal part 180 side of the second light emitting part 110b to the terminal part 180. .

In the present embodiment, the area of the first region 170b of the second wiring 120b is smaller than the light emitting device 10 according to the reference example, and the difference from the area of the first region 170a of the first wiring 120a is small. It has become. Therefore, the difference between the rising period _{T R} of the first light emitting portion 110a and the second light emitting portion 110b is reduced, the difference in light emission luminance of the first light emitting portion 110a and the second light emitting portion 110b is less likely to be recognized.

The area of the first region 170a of the first wiring 120a, for example, the value of the ratio _S L / _{S E} of the area _{S E} of the area _{S L} and the first region 170a of the first light emitting portion 110a is in the case of two or more The area of the first region 170b of the second wiring 120b is not less than 50% and not more than 200%. When the value of S _L / S _E is smaller than 2, the area of the first region 170a may be larger than this range. Note that when the width of the first wiring 120a and the width of the second wiring 120b are substantially equal, the ratio of the areas can be replaced by the ratio of the length of the first region 170a and the length of the first region 170b. However, the ratio of the area of the first region 170a of the first wiring 120a to the first region 170b of the second wiring 120b is not limited to this range.

FIG. 9 is a diagram illustrating another example of a current waveform output from the control unit 200 to the light emitting unit 110. In each graph of FIG. 9A and FIG. 9B, the horizontal axis represents time, and the vertical axis represents the current value. FIG. 9A shows a current waveform when the luminance is relatively high, and FIG. 9B shows a current waveform when the luminance is relatively low. As shown in FIG. 9A, when the luminance is relatively high, the current value of the pulse current increases. As shown in FIG. 9B, when the luminance is relatively low, the current value of the pulse current is small.

FIG. 10 is a diagram illustrating the voltage and light emission luminance of the light emitting unit 110 in the region surrounded by B in FIG. In each graph of Fig.10 (a) and FIG.10 (b), a horizontal axis represents time and the vertical axis | shaft represents the voltage. In each graph of FIG. 10C and FIG. 10D, the horizontal axis represents time, and the vertical axis represents light emission luminance. FIGS. 10A and 10C show waveforms of voltage and light emission luminance when the luminance is relatively high, and FIGS. 10B and 10D show cases where the luminance is relatively low. The waveforms of the voltage and emission luminance are shown. As shown in equation (1), rising period T _R is inversely proportional to the current I. That is, the period T _R and rising high value of the current I is shortened, the period T _R and rising value of the current I is small, becomes longer. As shown in FIG. 10 (a) and FIG. 10 (c), the case relatively high brightness is because the larger the value of the current applied to the light emitting unit 110, the rising period T _R is shortened, emission period T ratio of the rising period T _R for the entire _E is reduced. As shown in FIG. 10 (b) and FIG. 10 (d), the case relatively low luminance value of the current applied to the light emitting portion 110 to become smaller, the rising period T _R becomes longer, the light-emitting period T ratio of the rising period T _R for the entire _E increases.

Figure 11 is a diagram for explaining a rise of the voltage and emission luminance of the light emitting portion 110 when the rising period T _R between a plurality of light emitting portions 110 is different. Similarly to FIG. 10, in each graph of FIG. 11A and FIG. 11B, the horizontal axis represents time, and the vertical axis represents voltage. Moreover, in each graph of FIG.11 (c) and FIG.11 (d), a horizontal axis represents time and the vertical axis | shaft represents light emission luminance. FIGS. 11A and 11C show waveforms of voltage and light emission luminance when the luminance is relatively high, and FIGS. 11B and 11D show cases where the luminance is relatively low. The waveforms of the voltage and emission luminance are shown. As described above, when a relatively high brightness, rising period T _R is shortened, the proportion of the rise period T _R for the whole light emission period T _E is reduced. Therefore, even if the rising period T _R between a plurality of light emitting portions 110 are different, smaller effect on the light emission luminance, the difference in luminance is hardly recognized. In contrast, if a relatively low luminance, the rise time T _R becomes longer, the proportion of the rise period T _R for the whole light emission period T _E increases. Therefore, if the rising period T _R between a plurality of light emitting portions 110 are different, greatly affects the light emission luminance, the difference in luminance is likely to be recognized. Therefore, in the case of adjusting the light emission luminance of the light emitting portion 110 with the value of current is also, by reducing the difference between the rising period T _R between a plurality of light emitting portions 110 and the difference in luminance is hardly recognized.

As described above, according to the present embodiment, in the case where the range of luminance required for the light emitting device 10 is wide, it is possible to improve the difference in luminance of each light emitting unit at all luminances.

Example 1
FIG. 12 is a plan view illustrating the light emitting device 10 according to the first embodiment. In the present embodiment, the light emitting device 10 includes a first light emitting unit 110a, a second light emitting unit 110b, a first wiring 120a, a second wiring 120b, a terminal unit 180, and a control unit 200. The first wiring 120 a connects the first light emitting unit 110 a and the terminal unit 180. The second wiring 120 b connects the second light emitting unit 110 b and the terminal unit 180. The terminal unit 180 is connected to the control unit 200. The first wiring 120 a intersects the side 190 a of the second electrode 160 facing the terminal portion 180. The second wiring 120 b intersects with a side 190 b other than the side 190 a facing the terminal portion 180 in the second electrode 160, and extends along the outer periphery of the second electrode 160.

The control unit 200 applies a pulse current to the light emitting unit 110 via the terminal unit 180 and the wiring 120.

The control unit 200 controls the luminance of the light emitting unit by controlling the pulse width of the pulse current. Specifically, when the luminance is relatively high, the pulse width (that is, the application time) of the pulse current is increased. When the luminance is relatively low, the pulse width of the pulse current is shortened.

In the example shown in this figure, since the second wiring 120b has a smaller area overlapping the second electrode 160 than when intersecting the side 190a facing the terminal portion 180, the area of the first region 170a of the first wiring 120a The difference in the area of the first region 170b of the second wiring 120b is small. Further, the area of the first light emitting unit 110a and the area of the second light emitting unit 110b are substantially equal. Therefore, compared to the case where the second wiring 120b intersects the side 190a, the ratio of the area of the first light emitting unit 110a to the area of the first region 170a of the first wiring 120a and the area of the second light emitting unit 110b The difference in the area ratio of the first region 170b of the second wiring 120b is small. Thus, the difference in the rising period _{T R} of the first light emitting portion 110a and the second light emitting portion 110b is reduced, the difference in light emission luminance of the first light emitting portion 110a and the second light emitting portion 110b can be improved.

(Example 2)
FIG. 13 is a plan view illustrating the light emitting device 10 according to the second embodiment. In the present embodiment, the light emitting device 10 has the same configuration as the light emitting device 10 according to the first embodiment, except for the direction in which the second wiring 120b is routed. The first wiring 120 a intersects the side 190 a of the second electrode facing the terminal portion 180. On the other hand, the second wiring 120b intersects a side 190b (side opposite to the side 190a in the example shown in the figure) of the second electrode 160, which is different from the side 190a facing the terminal portion 180, and The two electrodes 160 extend along the outer periphery.

In the example shown in the figure, the areas of the first light emitting unit 110a and the second light emitting unit 110b are equal. In addition, the area of the portion of the second wiring 120 b that overlaps with the second electrode 160 is smaller than when the second wiring 120 b intersects the side 190 a facing the terminal portion 180. For this reason, the difference between the area of the first region 170a of the first wiring 120a and the area of the first region 170b of the second wiring 120b is small. Therefore, compared to the case where the second wiring 120b intersects the side 190a, the ratio of the area of the first light emitting unit 110a to the area of the first region 170a of the first wiring 120a and the area of the second light emitting unit 110b The difference in the area ratio of the first region 170b of the second wiring 120b is small. Thus, the difference in the rising period _{T R} of the first light emitting portion 110a and the second light emitting portion 110b is reduced, the difference in light emission luminance of the first light emitting portion 110a and the second light emitting portion 110b can be improved.

(Example 3)
FIG. 14 is a plan view illustrating the light emitting device 10 according to the third embodiment. The light emitting device 10 according to the present example has the same configuration as that of the light emitting device 10 according to Example 1 except for the following points. First, the third light emitting unit 110c and the third wiring 120c that connects the third light emitting unit 110c and the terminal unit 180 are provided. Further, the routing direction of the second wiring 120b is also different. Specifically, the first wiring 120 a and the third wiring 120 c intersect the side 190 a of the second electrode 160 facing the terminal portion 180. The second wiring 120 b intersects with the side 190 b of the second electrode 160, which is different from the side 190 a facing the terminal part 180 (side intersecting the side 190 a in the example shown in the figure), and the outer periphery of the second electrode 160. Extends along.

In the example shown in the figure, the areas of the first light emitting unit 110a, the second light emitting unit 110b, and the third light emitting unit 110c are different, the area of the second light emitting unit 110b is the smallest, and the area of the third light emitting unit 110c. Is the largest. The third wiring 120c intersects the side 190a. The area of the third wiring 120c that overlaps the second electrode 160 is the area of the first wiring 120a that overlaps the second electrode 160 and the area of the second wiring 120b that overlaps the second electrode 160. It is larger than any of the areas. In addition, the area of the second wiring 120b that overlaps the second electrode 160 is smaller than the area where the second wiring 120b intersects the side 190a facing the terminal portion 180, and the first wiring 120a has a smaller area. Of these, the area of the region overlapping with the second electrode 160 and the area of the third wiring 120c overlapping with the second electrode 160 are smaller. That is, the area overlapping the second electrode 160 is the smallest for the second wiring 120b and the largest for the third wiring 120c. Therefore, compared to the case where the second wiring 120b intersects the side 190a, the ratio of the area of the first light emitting unit 110a to the area of the first region 170a of the first wiring 120a and the area of the second light emitting unit 110b The difference between the area ratio of the first region 170b of the second wiring 120b and the area ratio of the third light emitting unit 110c and the area of the first region 170c of the third wiring 120c is small. Therefore, the first light emitting portion 110a, the difference between the rising period _{T R} of the second light emitting portion 110b and a third light emitting unit 110c decreases, the first light-emitting portion 110a, the light emission luminance of the second light emitting portion 110b and a third light emitting unit 110c The difference is improved.

Example 4
FIG. 15 is a plan view illustrating the light emitting device 10 according to the fourth embodiment. The light emitting device 10 according to the present example has the same configuration as that of the light emitting device 10 according to Example 1 except for the following points.

The second electrode 160 has a side 190a, a side 190b, a side 190c, and a side 190d. The side 190 a faces the terminal portion 180. The side 190c is on the opposite side of the side 190a. The side 190b intersects the side 190a and the side 190c. The side 190d is on the opposite side of the side 190b and intersects the side 190a and the side 190c.

The first light emitting unit 110a and the second light emitting unit 110b are arranged along the extending direction of the side 190a or the side 190c. The first light emitting unit 110a is located closer to the side 190d than the second light emitting unit 110b, and the second light emitting unit 110b is located closer to the side 190b than the first light emitting unit 110a. In particular, in the example shown in the drawing, the area of the first light emitting unit 110a and the area of the second light emitting unit 110b are substantially equal, and the first light emitting unit 110a and the second light emitting unit 110b are arranged symmetrically. .

The first wiring 120a intersects the side 190d of the second electrode 160, and the second wiring 120b intersects the side 190b of the second electrode 160. The first wiring 120a includes a region (first region 170a) overlapping with the second electrode 160, and the second wiring 120b includes a region (first region 170b) overlapping with the second electrode 160. The first wiring 120 a includes a portion that extends along the outer periphery of the second electrode 160 in a region that does not overlap with the second electrode 160, and the second wiring 120 b is the second wiring in a region that does not overlap with the second electrode 160. A portion extending along the outer periphery of the electrode 160 is included. In particular, in the example shown in the drawing, the first wiring 120a and the second wiring 120b are arranged symmetrically.

Also in the example shown in this figure, since the area of the second wiring 120b overlapping the second electrode 160 is smaller than that of the example shown in FIG. 1, the area of the first region 170a of the first wiring 120a and the second wiring 120b The difference in the area of the first region 170b is small. Further, the area of the first light emitting unit 110a and the area of the second light emitting unit 110b are substantially equal. Therefore, as compared with the example shown in FIG. 1, the ratio of the area of the first light emitting unit 110a to the area of the first region 170a of the first wiring 120a, the area of the second light emitting unit 110b, and the area of the second wiring 120b. The difference in the area ratio of the first region 170b is small. Thus, the difference in the rising period _{T R} of the first light emitting portion 110a and the second light emitting portion 110b is reduced, the difference in light emission luminance of the first light emitting portion 110a and the second light emitting portion 110b can be improved.

Further, according to the example shown in this figure, the first wiring 120a and the second wiring 120b are simply linearly extended from the terminal part 180 to the first light emitting part 110a and the second light emitting part 110b, respectively. Thus, the area of the first region 170a and the area of the first region 170b can be reduced. Therefore, it is possible to reduce the capacitance of the capacitor C _L as described above, it is possible to shorten the rising time T _R of the voltage at each of the first light emitting portion 110a and the second light emitting portion 110b.

(Example 5)
FIG. 16 is a plan view illustrating the light emitting device 10 according to the fifth embodiment. The light emitting device 10 according to the present example has the same configuration as that of the light emitting device 10 according to Example 1 except for the following points.

As is clear from the description of the present embodiment, according to the present embodiment, the second electrode 160 is not limited to the shape of the second electrode 160 (for example, the side 190a, the side 190b, the side 190c, and the side shown in FIG. Even in the case of not having a side corresponding to 190d), the difference in emission luminance between the first light emitting unit 110a and the second light emitting unit 110b is improved in the same manner as in the first embodiment.

The first wiring 120a intersects at the first portion 162 on the outer periphery of the second electrode 160, and the second wiring 120b intersects at the second portion 164 on the outer periphery of the second electrode 160. The second portion 164 is located farther from the terminal portion 180 than the first portion 162. In particular, in the example shown in the drawing, the second portion 164 is further away from the terminal portion 180 than the first portion 162 in the Y direction in the drawing.

The substrate 100 has a side 100a, a side 100b, a side 100c, and a side 100d. The side 100a extends in the X direction in the drawing. The side 100c is on the opposite side of the side 100a and extends in the X direction in the drawing. The side 100b intersects the side 100a and the side 100c, and extends in the Y direction in the drawing. The side 100d is on the opposite side of the side 100b, intersects the side 100a and the side 100c, and extends in the Y direction in the drawing.

The second electrode 160 and the terminal portion 180 are arranged in the Y direction in the figure. The second electrode 160 is located closer to the side 100 c than the terminal portion 180, and the terminal portion 180 is located closer to the side 100 a than the second electrode 160.

Note that the arrangement direction of the second electrode 160 and the terminal portion 180 need not coincide with the extending direction of the side 100b or the side 100d of the substrate 100. The arrangement direction of the second electrode 160 and the terminal portion 180 can be determined independently of the extending direction of the side 100b or the side 100d of the substrate 100.

In the example shown in the figure, the shape of the second electrode 160 is a circle. In another example, the shape of the second electrode 160 may be a shape other than a circle. As described above, according to the present embodiment, even if the shape of the second electrode 160 is a shape other than a circle, the light emission luminance of the first light emitting section 110a and the second light emitting section 110b is the same as in the first embodiment. The difference is improved.

The first light emitting unit 110a and the second light emitting unit 110b are arranged in the Y direction in the drawing. The first light emitting unit 110a is located closer to the terminal portion 180 (side 100a) than the second light emitting unit 110b, and the second light emitting unit 110b is closer to the side 100c than the first light emitting unit 110a. positioned.

The first wiring 120a includes a region overlapping with the second electrode 160 (first region 170a). The first region 170a extends from the first light emitting unit 110a to the opposite side of the second light emitting unit 110b in the Y direction in the drawing. Therefore, in the Y direction in the figure, the first portion 162 is aligned with the first light emitting unit 110a, and the first portion 162 is located closer to the terminal unit 180 than the first light emitting unit 110a. The first wiring 120 a does not include a portion that extends along the outer periphery of the second electrode 160 in a region that does not overlap the second electrode 160, and extends linearly from the outer periphery of the second electrode 160 to the terminal portion 180. ing.

The second wiring 120b includes a region overlapping with the second electrode 160 (first region 170b). The first region 170b extends from the second light emitting unit 110b in the X direction in the drawing. Therefore, the second portion 164 is aligned with the second light emitting unit 110b in the X direction in the drawing. The second wiring 120 b includes a portion that extends along the outer periphery of the second electrode 160 in a region that does not overlap the second electrode 160.

Also in the example shown in this figure, since the area of the second wiring 120b overlapping the second electrode 160 is smaller than that of the example shown in FIG. 1, the area of the first region 170a of the first wiring 120a and the second wiring 120b The difference in the area of the first region 170b is small. Therefore, as compared with the example shown in FIG. 1, the ratio of the area of the first light emitting unit 110a to the area of the first region 170a of the first wiring 120a, the area of the second light emitting unit 110b, and the area of the second wiring 120b. The difference in the area ratio of the first region 170b can be reduced. Thus, the difference in the rising period _{T R} of the first light emitting portion 110a and the second light emitting portion 110b is reduced, the difference in light emission luminance of the first light emitting portion 110a and the second light emitting portion 110b can be improved.

(Example 6)
FIG. 17 is a plan view illustrating the light emitting device 10 according to the sixth embodiment. The light-emitting device 10 according to the present example has the same configuration as the light-emitting device 10 according to Example 5 except for the following points.

The second wiring 120b includes a region overlapping with the second electrode 160 (first region 170b). The first region 170b extends from the second light emitting unit 110b to the opposite side of the first light emitting unit 110a in the Y direction in the drawing. Therefore, in the Y direction in the figure, the second portion 164 is aligned with the second light emitting portion 110b, and the second portion 164 is located farther from the terminal portion 180 than the second light emitting portion 110b. The second wiring 120 b includes a portion that extends along the outer periphery of the second electrode 160 in a region that does not overlap the second electrode 160.

The second portion 164 is located on the opposite side of the first portion 162 with the first light emitting portion 110a and the second light emitting portion 110b interposed therebetween.

Also in the example shown in this figure, similarly to the example shown in FIG. 16, the difference between the area of the first region 170a of the first wiring 120a and the area of the first region 170b of the second wiring 120b can be reduced. . Accordingly, the difference in light emission luminance between the first light emitting unit 110a and the second light emitting unit 110b is improved.

(Example 7)
FIG. 18 is a plan view illustrating the light emitting device 10 according to the seventh embodiment. The light-emitting device 10 according to the present example has the same configuration as the light-emitting device 10 according to Example 5 except for the following points.

Similarly to the example shown in FIG. 14, the areas of the first light emitting unit 110a, the second light emitting unit 110b, and the third light emitting unit 110c are different, and the area of the second light emitting unit 110b is the smallest, The area of the portion 110c is the largest.

Similarly to the example shown in FIG. 14, the areas of the first region 170a, the first region 170b, and the first region 170c are different from each other, the area of the first region 170b is the smallest, and the area of the first region 170c is the same. It is the largest.

The first wiring 120a, the second wiring 120b, and the third wiring 120c intersect at the first portion 162, the second portion 164, and the third portion 166 on the outer periphery of the second electrode 160, respectively. In the Y direction in the drawing, the first portion 162, the second portion 164, and the third portion 166 are separated from the terminal portion 180 by different distances, and the third portion 166 is located closest to the terminal portion 180, The second portion 164 is farthest from the terminal portion 180.

Also in the example shown in this figure, similarly to the example shown in FIG. 14, the ratio of the area of the first light emitting unit 110a to the area of the first region 170a of the first wiring 120a and the area of the second light emitting unit 110b The difference between the ratio of the area of the first region 170b of the second wiring 120b and the ratio of the area of the third light emitting unit 110c and the area of the first region 170c of the third wiring 120c can be reduced. Therefore, the first light emitting portion 110a, the difference between the rising period _{T R} of the second light emitting portion 110b and a third light emitting unit 110c decreases, the first light-emitting portion 110a, the light emission luminance of the second light emitting portion 110b and a third light emitting unit 110c The difference is improved.

(Example 8)
FIG. 19 is a plan view of the light emitting device 10 according to the eighth embodiment. The light-emitting device 10 according to the present example has the same configuration as the light-emitting device 10 according to Example 5 except for the following points.

The first wiring 120a intersects at the first portion 162 on the outer periphery of the second electrode 160, and the second wiring 120b intersects at the second portion 164 on the outer periphery of the second electrode 160. The second part 164 is located on the opposite side of the first part 162 with the first light emitting part 110a and the second light emitting part 110b interposed therebetween.

The first light emitting unit 110a and the second light emitting unit 110b are arranged in the first direction (X direction in the drawing). The terminal portion 180 is aligned with the first light emitting portion 110a and the second light emitting portion 110b in a second direction (Y direction in the drawing) orthogonal to the first direction. The first region 170a extends from the first light emitting unit 110a in the first direction (X direction) to the opposite side of the second light emitting unit 110b. Accordingly, the first portion 162 is aligned with the first light emitting unit 110a in the first direction (X direction). The first region 170b extends from the second light emitting unit 110b in the first direction (X direction) to the opposite side of the first light emitting unit 110a. Therefore, the second portion 164 is aligned with the second light emitting unit 110b in the first direction (X direction).

The area of the first light emitting unit 110a and the area of the second light emitting unit 110b are substantially equal, and the first light emitting unit 110a and the second light emitting unit 110b are arranged symmetrically.

The first wiring 120 a includes a portion that extends along the outer periphery of the second electrode 160 in a region that does not overlap with the second electrode 160, and the second wiring 120 b is the second wiring in a region that does not overlap with the second electrode 160. A portion extending along the outer periphery of the electrode 160 is included. In particular, in the example shown in the drawing, the first wiring 120a and the second wiring 120b are arranged symmetrically.

As mentioned above, although embodiment and the Example were described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

This application claims priority based on Japanese Patent Application No. 2017-066422, filed on Mar. 29, 2017, the entire disclosure of which is incorporated herein.

Claims

A first light emitting unit and a second light emitting unit having a laminated structure including a first electrode, an organic layer including a light emitting layer, and a second electrode;
A first wiring connecting the first electrode of the first light emitting unit and the terminal unit;
A second wiring connecting the first electrode of the second light emitting unit and the terminal unit;
With
The second electrode is located across the first light emitting part and the second light emitting part,
The first wiring intersects a side of the second electrode facing the terminal portion;
The light emitting device, wherein the second wiring intersects a side of the second electrode that does not face the terminal portion and extends along an outer periphery of the second electrode.
The light-emitting device according to claim 1,
A light emitting device comprising an insulating layer provided on each of a portion where the first wiring and the second electrode overlap each other and a portion where the second wiring and the second electrode overlap each other.
The light-emitting device according to claim 1 or 2,
The light-emitting device in which the distance from the terminal part side end of the first light emitting part to the terminal part is closer than the distance from the terminal part side end of the second light emitting part to the terminal part.
The light emitting device according to any one of claims 1 to 3,
A control unit connected to the terminal unit;
The control unit is a light emitting device that applies a pulse current to each of the first light emitting unit and the second light emitting unit.
The light-emitting device according to claim 4,
The control unit is a light emitting device that controls luminance of the first light emitting unit and the second light emitting unit by controlling a pulse width of the pulse current.
The light-emitting device according to claim 4,
The control unit is a light-emitting device that controls brightness of the first light-emitting unit and the second light-emitting unit by controlling the magnitude of the current of the pulse current.
A first light emitting unit and a second light emitting unit having a laminated structure including a first electrode, an organic layer including a light emitting layer, and a second electrode;
A first wiring connecting the first electrode of the first light emitting unit and the terminal unit;
A second wiring connecting the first electrode of the second light emitting unit and the terminal unit;
With
The second electrode is located across the first light emitting part and the second light emitting part,
The first wiring intersects with the first portion of the outer periphery of the second electrode,
The light emitting device, wherein the second wiring intersects at a second portion of the outer periphery of the second electrode, and the second portion is located farther from the terminal portion than the first portion.
The light-emitting device according to claim 7,
The light emitting device, wherein the first portion of the outer periphery of the second electrode is located closer to the terminal portion than the first light emitting portion.
The light-emitting device according to claim 7 or 8,
The light emitting device, wherein the second wiring includes a portion extending along an outer periphery of the second electrode.
A first light emitting unit and a second light emitting unit having a laminated structure including a first electrode, an organic layer including a light emitting layer, and a second electrode;
A first wiring connecting the first electrode of the first light emitting unit and the terminal unit;
A second wiring connecting the first electrode of the second light emitting unit and the terminal unit;
With
The second electrode is located across the first light emitting part and the second light emitting part,
The first wiring intersects with the first portion of the outer periphery of the second electrode,
The second wiring intersects with a second part of the outer periphery of the second electrode, and the second part is located on the opposite side of the first part across the first light emitting part and the second light emitting part. Light emitting device.
The light-emitting device according to claim 10,
The first light emitting unit and the second light emitting unit are arranged in a first direction,
The terminal portion is aligned with the first light emitting portion and the second light emitting portion in a second direction orthogonal to the first direction,
The first portion is aligned with the first light emitting unit in the first direction,
The light emitting device, wherein the second portion is aligned with the second light emitting unit in the first direction.